Java
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Java – incompatible types and fresh type variables
I get the following compilation message: [javac] ... error: incompatible types [javac] exceptionClassHolder …… -
JavaFX – how to make ComboBox hgrow?
I have JavaFX (8), H@R_509_2419 @, Combo@R_509_2419 @And hgrow This is my fxml Code: <?xml version="1.0" encoding="…… -
Java – you can mark interfaces, such as serializable, which contains default methods?
I don't think it can, because the principle of markup interface is that there is no method, but I don't know because t…… -
Java – should you report the message text of the exception?
Consider some code that can throw a check exception (an exception of type exception) Of course, your code catches exce…… -
java – Make Enum. Tostring() localization
I'm developing an Android application and I want to know if I can set enum Tostring() multilingual I'll use this enume…… -
Java – when to use servicetracker and servicereference
I've just started using OSGi programming, and I've encountered two ways to listen to activated services The first meth…… -
Parallelism and plan view in Java 8 streams
Hey, I have a problem with parallelism when I use flatmap IntStream.of(-1,1).parallel().flatMap(i->IntStream.range(…… -
Java – why do you get a NullPointerException when comparing a string with null?
My code uses NullPointerException to break in the following line: if (stringVariable.equals(null)){ Before this statem…… -
java – com. w3c. dom. Document does not have
I'm using the following code to create com. Com from string w3c. dom. Document： DocumentBuilderFactory docFactory = D…… -
Java – LinkedHashMap signature
Looking at the JDK source code of LinkedHashMap, I notice that this class is declared as: public class LinkedHashMap&l…… -
Remote virtual machine using vagrant
I want to use vagrant to make the virtual machine run on a more powerful server than my laptop Can I use vagrant remot…… -
Java – Maven cannot find dependencies
I use Maven 3.1 Version 1 I'm trying to compile with dependency springs I see that this should exist in Maven through …… -
Java – get the metadata of the file
Can I know the metadata of a file through Java? If so, how to get the metadata of the file in Java? Solution You can g…… -
Java – “a value of type string cannot be opened below the source level..” error
I am using eclipse to develop a java program I had to downgrade JRE and JDK from 1.7x to 1.6 Now everything points to …… -
How does Java’s dynamic proxy actually work?
I know how to use dynamic proxies in Java, but what I don't understand is how VM actually creates dynamic proxies Does…… -
Java – how to set the ForeignKey name when I have @ manytomany
I am using JPA class to create database If we have a manytoone relationship, we can override the ForeignKey name, as s…… -
Java – JPA POJO as data object
What are the best practices for using JPA entities? Since the JPA entity is only a POJO, is it appropriate to use this…… -
Jpa-2.0 – execute @ postload_ after_ Eagerly extract?
Using JPA2 / Hibernate, I created an entity a with a one-way mapping to entity x (see below) In a, I also have a tempo…… -
How do I register JavaScript callbacks in a java applet?
I'm developing an invisible Java applet that will be completely controlled by JavaScript I can easily call the Java me…… -
Java – how to disable errorpagefilter in spring boot?
I am creating a soap service that should run on Tomcat @Configuration @EnableAutoConfiguration(exclude = ErrorMvcAutoC…… -
Java – automatically redirect from one JSP page to another
Once the home page is loaded, can users be automatically redirected to the second JSP page@ H_ 502_ 2@ resolvent Solut…… -
Using Java’s recursive expression evaluator
I want to write an expression evaluator that only does addition and subtraction I have a simple algorithm to do this; …… -
Java – does JSF use JSP?
I'm learning JSF and I have some questions I know JSF is a UI framework for making pages. I'm using it and successfull…… -
Java – error adding edit text in eclipse
I'm building Android apps for tablets I tried to add an EditText in the graphical view of eclipse, but when I selected…… -
Java – what is the meaning of the three points in the function parameters?
There is already an answer to this question: > java, 3 dots in parameters8 private class DownloadFilesTask extends …… -
Java – how does akka implement the relationship before JMM?
In the official akka document, they refused: For details, please refer to the doc I wonder how akka did it I just pass…… -
Java – what are the benefits of extending generics by specifying new types as the actual types of generics
I saw this pattern somewhere: @ h_ 403_ 2@class A extends B { } This structure is somewhat unusual for extending gener…… -
Java – JPA: @ primarykeyjoincolumn (…) and @ joincolumn (…, insertable =?, updatable =?) Same?
It can be derived from the JPA specification if there is no @ primarykeyjoincolumn (...) with pluggable and updatable …… -
Java – how to use mockito to display all simulated calls
One of my units failed the test. I'm not sure why I want to be able to see all simulated calls that occur in the syste…… -
How to read files from a remote system using Java?
I have a file copied on one computer and I need to access the file from another computer to update: I'm using Ubuntu L…… -
Java – how to run formbackingobject and referencedata objects in spring web MVC cycle?
I am new to the spring framework and try to understand the functions of formbackingobjects and compare them with the r…… -
Syntax – clojure: [] What do you do in the function parameter list?
I'm trying to solve clojure's joy and want to know_ The function of syntax in function parameter vector Example: (def ……